<!DOCTYPE html>
<html>
    <canvas id ='c' width='400' height='400'></canvas>
    <script>
        var c = document.getElementById('c');
        var gl = c.getContext("experimental-webgl");
        gl.clearColor(0,0,0.8,1);
        gl.clear(gl.COLOR_BUFFER_BIT);
		
    </script>
</html>
